Q.

If the coefficients of (2r + 4)th and (r – 2)th terms in the expansion of (1+x)18 are equal, then value of r is

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a

5

b

6

c

7

d

9

answer is B.

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Detailed Solution

18C2r+3=18Cr−3⇒2r+3=r−3 or 18=(2r+3)+(r−3)⇒ r=−6 or r=6
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If the coefficients of (2r + 4)th and (r – 2)th terms in the expansion of (1+x)18 are equal, then value of r is